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# java.time.zone

Support for time-zones and their rules.

Daylight Saving Time and Time-Zones are concepts used by Governments to alter local time. This package provides support for time-zones, their rules and the resulting gaps and overlaps in the local time-line typically caused by Daylight Saving Time.

### Package specification

Unless otherwise noted, passing a null argument to a constructor or method in any class or interface in this package will cause a `NullPointerException` to be thrown. The Javadoc "@param" definition is used to summarise the null-behavior. The "@throws `NullPointerException`" is not explicitly documented in each method.

All calculations should check for numeric overflow and throw either an `ArithmeticException` or a `DateTimeException`.

## Classes

ZoneOffsetTransition | A transition between two offsets caused by a discontinuity in the local time-line.
ZoneOffsetTransitionRule | A rule expressing how to create a transition.
ZoneRules | The rules defining how the zone offset varies for a single time-zone.

## Enums

ZoneOffsetTransitionRule.TimeDefinition | A definition of the way a local time can be converted to the actual transition date-time.

## Exceptions

ZoneRulesException | Thrown to indicate a problem with time-zone configuration.

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